Nissan Note E12. Manual - part 122

DEF-18

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER RELAY

REAR WINDOW DEFOGGER RELAY

Description

INFOID:0000000009477900

Power is supplied to the rear window defogger with BCM control.

Component Function Check

INFOID:0000000009477901

1.

CHECK FUNCTION

1. Turn ignition switch ON.

2. Check that an operation noise of rear window defogger relay can be heard when turning the rear window

defogger switch ON.

Is the inspection result normal?

YES

>> Rear window defogger relay function is OK.

NO

>> Refer to 

DEF-18, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000009477902

Regarding Wiring Diagram information, refer to 

DEF-9, "Wiring Diagram"

.

1.

CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF and disconnect rear window defogger relay connector.

2. Turn ignition switch ON.

3. Check voltage between rear window defogger relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FUSE

1. Turn ignition switch OFF.

2. Check 10A fuse (No. 5).
Is the inspection result normal?

YES

>> Check ignition power supply circuit. Refer to 

PG-22, "Wiring Diagram — Ignition Power Supply —

"

.

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

3.

CHECK REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect BCM connector.

3. Check continuity between BCM harness connector and rear window defogger relay harness connector.

4. Check continuity between BCM harness connector and ground.

(+)

(

−)

Voltage (V)

(Approx.)

Rear window defogger relay

Connector

Terminal

M14

1

Ground

Battery voltage

BCM

Rear window defogger relay

Continuity 

Connector

Terminal

Connector

Terminal

M18

1

M14

2

Yes

REAR WINDOW DEFOGGER RELAY

DEF-19

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

M

A

B

DEF

N

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness.

4.

CHECK REAR WINDOW DEFOGGER RELAY

Refer to 

DEF-19, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-67, "Removal and Installation"

.

NO

>> Replace rear window defogger relay.

Component Inspection

INFOID:0000000009477903

Check continuity between terminal 3 and 5.

BCM

Ground

Continuity 

Connector

Terminal

M18

1

No

Terminal

Condition

Continuity

3 and 5

12 V direct current supply between terminal 1 
and 2

Yes

No current supply

No

SEF497Y

DEF-20

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000009477904

Heats the heating wire with the power supply from the rear window defogger relay to prevent the rear window

from fogging up.

Component Function Check

INFOID:0000000009477905

1.

 CHECK REAR WINDOW DEFOGGER

Check that the heating wire of rear window defogger is heated when turning the rear window defogger switch

ON.
Is the inspection result normal?

YES

>> Rear window defogger is OK.

NO

>> Refer to 

DEF-20, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009477906

Regarding Wiring Diagram information, refer to 

DEF-9, "Wiring Diagram"

.

1.

 CHECK FUSES 

Check if any of the following fuses in fuse block (J/B) are blown.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2.

 CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between rear window defogger relay connector and ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Check the following:

• Rear window defogger relay.

• Battery power supply circuit.

3.

 CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between rear window defogger connector and ground.

COMPONENT PARTS

AMPERE

FUSE NO.

Fuse block (J/B)

20A

11

Terminals

Condition of rear 

window defogger 

switch

Voltage (V)

(Approx.)

(+)

(–)

Rear window 

defogger relay 

connector

Terminal 

M14

5

Ground

ON Battery 

voltage

OFF

0

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

DEF-21

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

M

A

B

DEF

N

O

P

Is the inspection result normal?

YES

>> GO TO 4

NO

>> GO TO 5

4.

 CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect rear window defogger.

3. Check continuity between rear window defogger connector and ground.

Is the inspection result normal?

YES

>> GO TO 6

NO

>> Repair or replace harness.

5.

 CHECK HARNESS CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect rear window defogger relay connector and condenser connector.

3. Check continuity between rear window defogger relay connector and condenser connector.

Is the inspection result normal?

YES

>> Replace condenser. Refer to 

DEF-26, "Removal and Installation"

.

NO

>> Replace or repair harness.

6.

 CHECK FILAMENT

Check filament.

Refer to 

DEF-21, "Component Inspection"

.

Is the inspection result normal?

YES

>> Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Repair filament. Refer to 

DEF-24, "Inspection and Repair"

.

Component Inspection

INFOID:0000000009477907

1.

 CHECK FILAMENT

Check the filament for damage or open circuits.

Refer to 

DEF-24, "Inspection and Repair"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair filament. Refer to 

DEF-24, "Inspection and Repair"

.

Terminals

Condition of rear 

window

 defogger switch

Voltage (V)

(Approx.)

(+)

(–)

Rear window 

defogger 

connector

Terminal 

B50

1

Ground

ON

Battery voltage

OFF

0

Rear window defogger connector

Terminal

Ground

Continuity 

B51

2

Yes

Rear window 

defogger relay 

connector

Terminal

Condenser connector

Terminal

Continuity 

M14

5

B42

1

Yes